Physics - Wave on String Question with Solution | TestHub

Two strings$\mathrm{A}$and$\mathrm{B}$of lengths,$L_A=80\mathrm{ }\mathrm{cm}$and$L_B=x\mathrm{ }\mathrm{cm}$respectively are used separately in a sonometer. The ratio of their densities is$0.81$. the diameter of$\mathrm{B}$is one-half that of$\mathrm{A}$. if the strings have the same tension and fundamental frequency the value of$x$is